plotting

i've a problem in this code ... there isn't any output graph .. i don't know why ???

for t=0:.00001:1;
  n=n+1;
  x1=2.5*cosd(10*pi*t);
  x2=2*cosd(8*pi*t);  
  x1(n)=x1;
  x2(n)=x2;
end
plot(t,x1)
hold on
plot(t,x2)

[Jan]

Please use code formatting as explained in the "Markup help" link.

Answer 1

[Robert Cumming]

your plotting your vector x1 against a scalar value of t.

Change your code to:

figure
plot([0:.00001:1],x1) 
hold on 
plot([0:.00001:1],x2)

[Jan]

Adding unnecessary square brackets around a vector wastes time. "0:00001:1" is a vector already.

[Robert Cumming]

True - they are unnecesary...

Do you mean computational time or typing time?

I originally started doing it as I (personally) think its more readable...

Now I do it without thinking about it - maybe its a bad habit - but they are the hardest to break... ;)

Answer 2

[Andrei Bobrov]

t=0:.00001:1;
plot(t,2.5*cosd(10*pi*t))
hold on
plot(t,2*cosd(8*pi*t))

or

plot(t,[2.5*cosd(10*pi*t),2*cosd(8*pi*t)])

[Mohammed Anveez]

even iam facing same issue in plotting

Answer 3

[mohamed saber]

thanks to all

Answer 4

[AR]

How can I plot the my Liklihood function for a large n, say at 100, to show max? fplot did not work.

L_theta=1/16*((1+x1*theta)*(1+x2*theta)*(1+x3*theta)*(1+x4*theta))
fplot(L_theta,[-1,1])

I used the iterative Newton method to solve via convergence to theta_MLE and would like to graphically display this as well.

Anyone have a suggestion?

Thank you.

Answer 5

[Pawello85]

Hello. I have a small problem to generate a higher resolution plot.

fs=1000; t=0.075:1/fs:0.225; fi=0; A=0.5; f=10:190/150:200; w=2*pi*f; x=A*cos(w.*t+fi); figure plot(t,x); xlabel('t [s]'); ylabel('Amplitude');

Answer 6

[carlos ruiz]

Hello i have s problem with this code i can not plot very well this vector

clc

clear

syms L real

T=[5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25]';%Periodos segundos

d=[5 10 30 50 80 100 200 1000 2000];%Tirante de agua profundidad

w=(2*pi./T).^2;

g=9.81;

for i=1:21

for d=1:9

K=2*pi/L;

f=g*(K)*tanh(K*d(1))-w(i);

Ls(i)=solve(f,'L')

Lss=eval(Ls')

end

end

y=abs(Lss)

grid on

hold on

plot(T,y,'r');

xlabel('Wave period T (sec)'); %Titulo del eje X

ylabel('Wave length'); %Titulo del eje Y

title('The dispersion relationship gives the relationship between wave period and wave length For linear waves in finite water depth d'); %Titulo del gráfico